The cicumference of any circle divided by its diameter is aways equal to pi.
circumference = pi*diameter
circumference of a circle = 2*pi*radius or pi*diameter
pi = circumference divided by diameter
16 pi = almost exactly 50¼
The perimeter of a full circle (circumference) is "pi" times the diameter. So the perimeter of a semi-circle will be half that; Perimeter = (pi/2) x (diameter).
using the formula circumference=diameter X pi: circumference=diameter X pi circumference/pi=diamter X pi/pi circumference/pi=diameter therefore, diameter=circumference/pi diameter=12mm/3.14 diameter=3.821mm
Approximately 37.68 inches. The formula is the value of Pi times the diameter of the cirle. Pi rounds to 3.14. Thus 12 X 3.14 = 37.68.
0.7161972439135291... Circumference = pi*diameter which yields circumference/pi = diameter 2.25/pi = diameter 2.25/pi = 0.7161972439135291...
Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
Circumference = Pi x Diameter (Pi equals 3.14)
Area = circumference squared... You do circumference divided by 4,... and then divide that by Pi.